This isn't a problem with Mavericks, it's a problem with Java 7u45 on any 
version of OSX.  Other people are reporting it on Mountain Lion.

On Tuesday, December 3, 2013 12:18:51 PM UTC-6, Sidney wrote:
>
> Hey Vinnie,
>
> Thanks for the response. So I am currently running OSX Mavericks, is the 
> options on stack overflow going to work with that OS? Also, do you by any 
> chance know how long it takes for Oracle to provide support for new OSX OSs?
>
> Thanks a bunch
>
> Sidney
>
> On Tuesday, November 26, 2013 10:31:12 AM UTC-8, Sidney wrote:
>>
>> Hey Everyone,
>>
>> Thanks in advance. I am working on the Guestbook tutorial provided on the 
>> app engine website. All I have done is created a new project and I am 
>> trying to run the project in the debugger console. This is the "error" I am 
>> getting:
>>
>> objc[6189]: Class JavaLaunchHelper is implemented in both 
>> /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/bin/java 
>> and 
>> /Library/Java/JavaVirtualMachines/jdk1.7.0_45.jdk/Contents/Home/jre/lib/libinstrument.dylib.
>>  
>> One of the two will be used. Which one is undefined.
>>
>> Usage: <dev-appserver> [options] <app directory>
>>
>>
>> Options:
>>
>>  --help, -h                 Show this help message and exit.
>>
>>  --sdk_root=DIR             Overrides where the SDK is located.
>>
>>  --server=SERVER            The server to use to determine the latest
>>
>>   -s SERVER                   SDK version.
>>
>>  --address=ADDRESS          The address of the interface on the local 
>> machine
>>
>>   -a ADDRESS                  to bind to (or 0.0.0.0 for all interfaces).
>>
>>  --port=PORT                The port number to bind to on the local 
>> machine.
>>
>>   -p PORT
>>
>>  --disable_update_check     Disable the check for newer SDK versions.
>>
>>  --generated_dir=DIR        Set the directory where generated files are 
>> created.
>>
>>  --default_gcs_bucket=NAME  Set the default Google Cloud Storage bucket 
>> name.
>>
>>  --jvm_flag=FLAG            Pass FLAG as a JVM argument. May be repeated 
>> to
>>
>>                               supply multiple flags.
>>
>>
>> Im not sure what to do from here to get it to run? 
>>
>

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